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opengl.shaders.lighting: Work around problem with specular highlighting.

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This commit is contained in:
Rod Kay
2024-02-25 18:35:44 +11:00
parent 6e2edae1fb
commit d328369d24
1 changed files with 7 additions and 6 deletions
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11
3-mid/opengl/assets/shader/lighting-frag.snippet
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@@ -36,7 +36,7 @@ apply_Light (light Light,
// Directional light. // Directional light.
// //
Surface_to_Light = normalize (-Light.Site.xyz); Surface_to_Light = normalize (-Light.Site.xyz);
Attenuation = 1.0; // No attenuation for directional lights. Attenuation = 1.0; // No attenuation for directional lights.
} }
else else
{ {
@@ -62,19 +62,20 @@ apply_Light (light Light,
} }
} }
vec3 lit_surface_Color = surface_Color * Light.Color; vec3 lit_surface_Color = surface_Color * Light.Color;
vec3 Ambient = Light.ambient_Coefficient * lit_surface_Color; vec3 Ambient = Light.ambient_Coefficient * lit_surface_Color;
float diffuse_Coefficient = max (0.0, float diffuse_Coefficient = max (0.0,
dot (Normal, dot (Normal,
Surface_to_Light)); Surface_to_Light));
vec3 Diffuse = diffuse_Coefficient * lit_surface_Color; vec3 Diffuse = diffuse_Coefficient * lit_surface_Color;
float specular_Coefficient = 0.0; float specular_Coefficient = 0.0;
if (diffuse_Coefficient > 0.0) if (diffuse_Coefficient > 0.0)
{ {
specular_Coefficient = pow (max (0.0, specular_Coefficient = pow (max (0.01, // Using '0.0' produces wierd results when
dot (Surface_to_Camera, dot (Surface_to_Camera, // light shines directly on a flat surface.
reflect (-Surface_to_Light, reflect (-Surface_to_Light,
Normal))), Normal))),
frag_Shine); frag_Shine);
@@ -82,7 +83,7 @@ apply_Light (light Light,
vec3 Specular = specular_Coefficient * specular_Color * Light.Color; vec3 Specular = specular_Coefficient * specular_Color * Light.Color;
return Ambient + Attenuation * (Diffuse + Specular); // Linear color (before gamma correction). return Ambient + Attenuation * (Diffuse + Specular); // Linear color (before gamma correction).
} }